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The two actors hopped aboard a boat in Los Angeles to shoot a scene for the film. K.Stew appeared in a navy-colored outfit, with a matching bathing suit underneath, while Garrison was in a similarly casual ensemble.

Later on in the day, Stewart was dressed in full military uniform, complete with cap and combat boots.

But the hourslong boat ride wasn't all sun and fun for the brunette beauty. She's gearing up to star in one of the more dramatic roles of her career.

Stewart is set to play an American soldier who gets stationed at the infamous prison camp as a guard and ends up befriending an inmate who has been there for three years.

Camp X-Ray was the name given to the seemingly temporary detention facility set up for the first terrorist suspects sent there in the months following the Sept. 11, 2011, terrorist attacks. This sounds like serious material for the star.

The 23-year-old actress was first seen working on the film on July 8, when she was headed into a Los Angeles studio for meetings regarding the movie.

Your information may be shared with other NBCUniversal businesses and used to better tailor our services and advertising to you. For more details about how we use your information, see our Privacy Policy. If you are located outside of the U.S., your information may be transferred to, processed and used in the U.S.